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hst/fs: implement overlay fstype
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This finally exposes overlay mounts in the high level hakurei API.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2025-08-15 03:30:51 +09:00
parent 4433c993fa
commit 9ed3ba85ea
12 changed files with 253 additions and 3 deletions
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50
hst/fsoverlay_test.go Normal file
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@@ -0,0 +1,50 @@
package hst_test
import (
"testing"
"hakurei.app/container"
"hakurei.app/hst"
)
func TestFSOverlay(t *testing.T) {
checkFs(t, []fsTestCase{
{"nil", (*hst.FSOverlay)(nil), false, nil, nil, nil, "<invalid>"},
{"nil lower", &hst.FSOverlay{Dst: m("/etc"), Lower: []*container.Absolute{nil}}, false, nil, nil, nil, "<invalid>"},
{"zero lower", &hst.FSOverlay{Dst: m("/etc"), Upper: m("/"), Work: m("/")}, false, nil, nil, nil, "<invalid>"},
{"zero lower ro", &hst.FSOverlay{Dst: m("/etc")}, false, nil, nil, nil, "<invalid>"},
{"short lower", &hst.FSOverlay{Dst: m("/etc"), Lower: ms("/etc")}, false, nil, nil, nil, "<invalid>"},
{"full", &hst.FSOverlay{
Dst: m("/nix/store"),
Lower: ms("/mnt-root/nix/.ro-store"),
Upper: m("/mnt-root/nix/.rw-store/upper"),
Work: m("/mnt-root/nix/.rw-store/work"),
}, true, container.Ops{&container.MountOverlayOp{
Target: m("/nix/store"),
Lower: ms("/mnt-root/nix/.ro-store"),
Upper: m("/mnt-root/nix/.rw-store/upper"),
Work: m("/mnt-root/nix/.rw-store/work"),
}}, m("/nix/store"), ms("/mnt-root/nix/.rw-store/upper", "/mnt-root/nix/.rw-store/work", "/mnt-root/nix/.ro-store"),
"w*/nix/store:/mnt-root/nix/.rw-store/upper:/mnt-root/nix/.rw-store/work:/mnt-root/nix/.ro-store"},
{"ro", &hst.FSOverlay{
Dst: m("/mnt/src"),
Lower: ms("/tmp/.src0", "/tmp/.src1"),
}, true, container.Ops{&container.MountOverlayOp{
Target: m("/mnt/src"),
Lower: ms("/tmp/.src0", "/tmp/.src1"),
}}, m("/mnt/src"), ms("/tmp/.src0", "/tmp/.src1"),
"*/mnt/src:/tmp/.src0:/tmp/.src1"},
{"ro work", &hst.FSOverlay{
Dst: m("/mnt/src"),
Lower: ms("/tmp/.src0", "/tmp/.src1"),
Work: m("/tmp"),
}, true, container.Ops{&container.MountOverlayOp{
Target: m("/mnt/src"),
Lower: ms("/tmp/.src0", "/tmp/.src1"),
}}, m("/mnt/src"), ms("/tmp/.src0", "/tmp/.src1"),
"*/mnt/src:/tmp/.src0:/tmp/.src1"},
})
}